Resolution of fine biological structure including small narcomedusae across a front in the Southern California Bight

Sam McClatchie, Robert Cowen, Karen Nieto, Adam Greer, Jessica Y. Luo, Cedric Guigand, David Demer, David Griffith, Daniel Rudnick

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

We sampled a front detected by SST gradient, ocean color imagery, and a Spray glider south of San Nicolas Island in the Southern California Bight between 14 and 18 October 2010. We sampled the front with an unusually extensive array of instrumentation, including the Continuous Underway Fish Egg Sampler (CUFES), the undulating In Situ Ichthyoplankton Imaging System (ISIIS) (fitted with temperature, salinity, oxygen, and fluorescence sensors), multifrequency acoustics, a surface pelagic trawl, a bongo net, and a neuston net. We found higher fluorescence and greater cladoceran, decapod, and euphausiid densities in the front, indicating increased primary and secondary production. Mesopelagic fish were most abundant in oceanic waters to the west of the front, market squid were abundant in the front associated with higher krill and decapod densities, and jack mackerel were most common in the front and on the shoreward side of the front. Egg densities peaked to either side of the front, consistent with both offshore (for oceanic squid and mesopelagic fish) and shelf origins (for white croaker and California halibut). We discovered unusually high concentrations of predatory narcomedusae in the surface layer of the frontal zone. Potential ichthyoplankton predators were more abundant either in the front (decapods, euphausiids, and squid) or shoreward of the front (medusae, chaetognaths, and jack mackerel). For pelagic fish like sardine, which can thrive in less productive waters, the safest place to spawn would be offshore because there are fewer potential predators.

Original languageEnglish
Article numberC04020
JournalJournal of Geophysical Research: Oceans
Volume117
Issue number4
DOIs
StatePublished - Jan 1 2012

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Southern California
Fish
Jacks
fishes
Fluorescence
Gliders
Water
jacks
predators
ichthyoplankton
Imaging systems
eggs
Acoustics
Oxygen
Color
sensors
fluorescence
fish
gliders
neuston

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Oceanography

Cite this

Resolution of fine biological structure including small narcomedusae across a front in the Southern California Bight. / McClatchie, Sam; Cowen, Robert; Nieto, Karen; Greer, Adam; Luo, Jessica Y.; Guigand, Cedric; Demer, David; Griffith, David; Rudnick, Daniel.

In: Journal of Geophysical Research: Oceans, Vol. 117, No. 4, C04020, 01.01.2012.

Research output: Contribution to journalArticle

McClatchie, S, Cowen, R, Nieto, K, Greer, A, Luo, JY, Guigand, C, Demer, D, Griffith, D & Rudnick, D 2012, 'Resolution of fine biological structure including small narcomedusae across a front in the Southern California Bight', Journal of Geophysical Research: Oceans, vol. 117, no. 4, C04020. https://doi.org/10.1029/2011JC007565
McClatchie, Sam ; Cowen, Robert ; Nieto, Karen ; Greer, Adam ; Luo, Jessica Y. ; Guigand, Cedric ; Demer, David ; Griffith, David ; Rudnick, Daniel. / Resolution of fine biological structure including small narcomedusae across a front in the Southern California Bight. In: Journal of Geophysical Research: Oceans. 2012 ; Vol. 117, No. 4.
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